CN106239970A

CN106239970A - The pressure buffer device of forcing press

Info

Publication number: CN106239970A
Application number: CN201610387555.5A
Authority: CN
Inventors: 河野泰幸
Original assignee: Aida Engineering Ltd
Current assignee: Aida Engineering Ltd
Priority date: 2015-06-03
Filing date: 2016-06-02
Publication date: 2016-12-21
Anticipated expiration: 2036-06-02
Also published as: JP6059291B2; US10259031B2; CN106239970B; JP2016221564A; EP3100799B1; US20160354828A1; EP3100799A1

Abstract

The present invention provides the die cushion of a kind of forcing press, including: multiple cushion pads；Multiple die buffer force producers, support multiple respective cushion pad, and can move up and down multiple respective cushion pad independently, and produce die buffer power independently for each cushion pad；And die buffer controller, control multiple die buffer force producer, to move up and down multiple respective cushion pad independently, and produce die buffer power independently for each cushion pad.

Description

The pressure buffer device of forcing press

Technical field

The present invention relates to the pressure buffer device of a kind of forcing press, relate more specifically to a kind of forcing press Die cushion, has the multiple cushion pads for a forcing press.

Background technology

So far, this die cushion is by Japanese Unexamined Patent Publication No: 06-000543 is (specially Profit document 1), Japanese Unexamined Patent Publication No 07-100552 (patent documentation 2) and Japanese patent application Publication number 2006-192481 (patent documentation 3) is disclosed.

Patent document 1 discloses that a kind of forcing press, including multiple cushion pads, each cushion pad passes through Cushion pins supports lower mold from below.Each pad component is connected to a tooth bar, and described tooth bar passes through one Reducing gear train is connected to the servo motor being arranged in each pad component.Numerical control device is to watching Each taking motor provides position control and direct torque to obtain action of giving.

In the inventive embodiment that patent documentation 1 describes, use four separate cushion pads, and Driving force can be transmitted by respective four pairs of Rack and pinion mechanism, each Rack and pinion mechanism By servo motor driven.Two pairs of Rack and pinion mechanism in four pairs of Rack and pinion mechanism are in direction, both sides Position, and the joint with minimum clearance is connected between each gear shaft.Four pairs of gear-tooth bar machines Two pairs of Rack and pinion mechanism in structure are also vertically positioning to direction, and in reducing gear train in Between gear be engaged with each other ([0007] section seeing patent documentation 1) with minimum clearance.That is, documents 1 shows that four pairs of Rack and pinion mechanism mechanically synchronize with minimum clearance.

Patent document 2 describe that the invention of the die cushion arranging forcing press, wherein pad is by delaying Qi of chong channel ascending adversely cylinder flexibly supports, and arranges numerically controlled NC bounce cylinder control cushion effect.Pad is divided Become multiple pad component, and each several part padding component couples to form flexibility by bonder each other Structure.Additionally, each pad component is arranged a bounce cylinder and a NC bounce cylinder.

Patent documentation 3 describes die cushion, and including multiple pulvinuluses, it accepts sliding by cushion pins The pressure of block, also includes the big pad supporting multiple pulvinulus, and thrust inducing device, and described thrust is produced Generating apparatus produces thrust upwards and is moved up and down by pad greatly while counter pressure.

Summary of the invention

Patent documentation 1 not only describes the base of the servo die buffer unit that can provide any action of giving Eigen, additionally provides some features, and it makes and use cylinder and hydraulic cylinder to provide action of giving Traditional device compare, the size that can realize single unit system reduces and low price, and makes it easy to Wrinkle or the workpiece ruptured, such as aluminum, can be by individually being controlled by servo motor of padding each Action of giving is avoided wrinkle or ruptures, but not description to reason.

Although not for the relation between features described above and clear by separate for cushion pad reason Description, it is believed that even if separately may be when forcing press (such as pillow) deformation also to material by cushion pad Uniformly applied predetermined die buffer power (to be applied).

Regrettably, although the die cushion that patent documentation 1 describes uses to drive each pads component Rack and pinion mechanism, multiple Rack and pinion mechanism are by joint and train mechanically to each otherly Synchronize.Therefore, even if this die cushion is controlled by any intention and wisdom, it is also not possible to Make die cushion as each pad component being arranged different die buffer strokes and mould Multiple die cushions of tool cushion effect use.

Additionally, drive multiple drive shafts of each Rack and pinion mechanism of pad component, it is up to tooth " surplus (play) " of the backlash of train, therefore, it is not possible to every to on the surface of cushion pad A part has a material of (big degree) different plate thickness, the blank such as tailored, or in both sides Or front and back to the blank holder (being used for adjusting pad) tilted, apply predetermined die buffer power, And do not cause mechanical strain.

Owing to power is interfered at respective between centers so that be also impossible to accurately to apply for multiple pads is every Die buffer power different for one.

Die cushion described by patent documentation 2 has the feature that by pad main body being separated And form pad component, and do not use the integrally-built cushion pad with high rigidity；To being provided for pad The NC bounce cylinder Applied Digital of each of component controls；The separate table of each separate pad component The bottom in face is coupled by bonder.Thus, it is to avoid for the inclination angle of each separate pad component Increase, and the change of die buffer power.

Regrettably, the die cushion described by patent documentation 2, and described by patent documentation 1 Die cushion is the same, it is impossible to as each pad component being arranged different die buffer strokes Use with multiple die cushions of die buffer power.

Owing to the bottom on the separate surface of each separate pad component is coupled by coupling element, therefore Each pad component can not be moved significantly, it is also not possible to for cushion pad at vertical direction Every part on surface has a material of different plate thickness, the blank such as tailored, or due to base Pad in formability adjusts and in both sides or front and back to the blank holder tilted, applies predetermined mould and delay Impulse force, and do not cause mechanical strain.Additionally, each of multiple pad components accurately can not be applied Different die buffer power.

If cushion pad is divided into multiple pad component, can in punching course pad component application point and The tilting moment to each pad component varying level is produced between the retroaction force at the center of pad component. As a result, each pads member bends, and can not smoothly decline to allow to limit precision realization pressure Power is formed.For solving this problem, the die cushion that patent documentation 3 describes includes being divided into multiple little The cushion pad of pad, so that the smooth decline of cushion pad, also includes that the big pad supporting multiple pulvinulus makes mould Cushion effect is evenly applied on each pulvinulus, also includes thrust inducing device, and described thrust produces Device moves up and down big pad.Unfortunately, due to multiple pulvinuluses are coupled to pad greatly so that impossible It is individually moved each pulvinulus, it is also not possible to have not to for the every part on the surface of cushion pad With the material of plate thickness, the blank such as tailored, or apply that pad adjusts in both sides or front and back To the blank holder tilted, apply predetermined die buffer power, and do not cause mechanical strain.Additionally, not Each of multiple pad components accurately may be applied different die buffer power.

Common technology is characterized in that of the die cushion that patent documentation 1-3 describes attempts by inciting somebody to action Cushion pad separately applies uniform die buffer power to cushion pad；And between separate pad component There is provided synchronous mechanism with keeping parallelism (synchronization).

If use synchronous mechanism, die buffer can be obtained in the range in stiffness of lazy-tongs Power or the synchronization action of cushion pad position.But, can not get than in the range in stiffness of lazy-tongs The synchronization action of the synchronization action higher precision (positive) obtained, additionally, each above-mentioned mould Buffer unit all cannot function as each of separate pad being arranged different die buffer strokes and The multiple die cushions arranging die buffer power use.

The application accordingly makes, and an object of the application is to provide the mould of a kind of forcing press Tool buffer unit, it is possible to have following function: in the situation of the deformation of the pillow not relying on centering forcing press Under, improve the function applying uniform die buffer power；With than mechanical synchronization between multiple cushion pads The higher accurate synchronization of precision；And it is used as multiple die cushions, it is possible to multiple cushion pads Each arranges die buffer stroke and die buffer power.

In order to achieve the above object, according to the die cushion bag of the forcing press of the one side of the application Include: multiple cushion pads；Multiple die buffer force producers, support multiple respective cushion pad, and Multiple respective cushion pad can be moved up and down independently, and produce independently for each cushion pad Die buffer power；And die buffer controller, control multiple die buffer force producer with independently Move up and down multiple respective cushion pad, and produce die buffer independently for each cushion pad Power.

One side according to the application, it is possible in the case of not having mechanical restriction, will be provided for many The uniform die buffer power of each of individual cushion pad or desired die buffer power ground accurately apply To multiple cushion pads.

According to the die cushion of the application forcing press on the other hand, multiple cushion pads have general Die buffer stroke, and die buffer controller includes that a die buffer controller is with by multiple Respective cushion pad controls as a cushion pad.

Another aspect according to the application, it is possible to each uniform of multiple cushion pad will be provided for Die buffer power or desired die buffer power be accurately applied to multiple cushion pad, and by multiple Cushion pad controls essentially as a cushion pad.

The die cushion of the forcing press of the another aspect according to the application, including multiple cushion pad positions Put detector, detect the cushion pad position of multiple respective cushion pad.In die cushion, mould Tool buffer control unit includes that die buffer positioner, die buffer positioner include that output is logical The die buffer position command device of die buffer position command and multiple position control compensate Device, described position control compensator is general based on export from described die buffer position command device Die buffer position command and the die buffer position by the detection of multiple respective cushion pad position detectors Put and control multiple respective die buffer force producer, to move up and down multiple cushion pad independently Each.

Another aspect according to the application, it is possible to control the position of multiple cushion pad, the most multiple bufferings Pad is considered a cushion pad virtually.

In the die cushion of the forcing press of the another aspect according to the application, it is preferable that for many Each of individual cushion pad arranges two or more die buffer force producers, and wherein corresponding to The plurality of cushion pad position detector of the plurality of respective die buffer force producer is set, To be detected as each two or more die buffer force producer arranged of multiple cushion pad Each in position, or detect the die buffer position that each in described position is neighbouring.Also Preferably, the multiple position control compensators corresponding to multiple respective die buffer force producers are set Put, with based on export from die buffer position command device corresponding to multiple cushion pads each Respective die buffer position command and by the corresponding buffering in multiple cushion pad position detectors The die buffer position of pad position detector detection controls each of multiple die buffer force producer Individual, to move up and down each of multiple cushion pad independently.

Another aspect according to the application, it is possible to control the position of multiple cushion pad, the most multiple bufferings Pad and be considered a cushion pad virtually, and especially, it is possible to control the position of each cushion pad Put so that each cushion pad will not tilt.

The die cushion of the forcing press of the another aspect according to the application, including multiple die buffers Force detector, detects being applied to multiple cushion pad from multiple respective die buffer force producer Corresponding die buffer power.In die cushion, die buffer controller includes die buffer power Controller, die buffer force controller includes die buffer power command device, exports general mould and delays Impulse force order or corresponding to the independent die buffer power order of each of multiple cushion pads to multiple moulds Tool cushion effect generator, also includes die buffer power control and compensation device, based on from described die buffer power The general die buffer power order of command device output or individually die buffer power order and by many The die buffer power of each detection of individual die buffer force detector controls multiple die buffer power Each of generator, with apply independent die buffer power give multiple cushion pads each.

Another aspect according to the application, it is possible to accurately apply corresponding to the mould general to multiple cushion pads The uniform die buffer power of tool cushion effect order or corresponding to phase of respective die buffer power order The die buffer power hoped.

In the die cushion of the forcing press of the another aspect according to the application, preferably two or More die buffer force producers be arranged in multiple cushion pad each on, and wherein corresponding to Multiple die buffer force detectors of multiple respective die buffer force producers are set, with detection from Each die buffer power that multiple respective die buffer force producers are applied on multiple cushion pad. It is further preferred that multiple die buffer power control and compensation devices are based on defeated from described die buffer power command device The general die buffer power order that goes out or individually die buffer power order and by multiple die buffers The die buffer power of each detection of force detector controls multiple respective die buffer power and produces Device, to apply independent die buffer power to multiple cushion pads.

Another aspect according to the application, it is possible to will correspond to the uniform of general die buffer power order Die buffer power or desired die buffer power corresponding to respective die buffer power order accurate Be applied to multiple cushion pad, and especially, it is possible to even accurately apply in a cushion pad Isostatic mold cushion effect, or desired die buffer power is for arranging the every of die buffer force producer One position.

The die cushion of the forcing press of the another aspect according to the application, it is preferable that die buffer Power command device can be arranged the general die buffer power order of multiple die buffer force producers, right Two or more die buffer force producers being arranged in each of cushion pad are general moulds Tool cushion effect order or two or more moulds in each being arranged in cushion pad delay The single die buffer power order of each of impulse force generator, and the mould set by output is slow Impulse force order.

According to further aspect of the application, it is possible to apply uniform die buffer to multiple cushion pads Power, or accurately apply desired die buffer power for arranging each position of die buffer force producer Put, and especially, it is possible to according to the die buffer power order set by die buffer power command device Suitable applying die buffer power.

The die cushion of the forcing press of the another aspect according to the application, multiple cushion pads have list Only die buffer stroke, and die buffer controller includes multiple die buffer controller, controls Multiple respective cushion pads, and multiple die buffer controller also controls multiple respective cushion pad.

Another aspect according to the application, it is possible to accurately independent to each applying of multiple cushion pads Die buffer power, and especially, die cushion can delay for multiple moulds according to application Flushing device, and can be used for multiple shaping.

The die cushion of the forcing press of the another aspect according to the application, including: multiple cushion pads Position detector, detects the position of multiple respective cushion pad.In die cushion, Duo Gemo Each of tool buffer control unit includes die buffer positioner, this die buffer positioner Including die buffer position command device, export the single mould of each corresponding to multiple cushion pads Tool buffer position order, also includes position control compensator, based on from die buffer position command device The die buffer position command of output and corresponding slow by multiple cushion pad position detectors The position of the cushion pad of die head position detector detection controls in multiple die buffer force producer Corresponding die buffer force producer, corresponding slow with move up and down in multiple cushion pad independently Die head.

According to the another aspect of the application, die cushion can serve as multiple die cushion, For multiple respective cushion pads.As a result, different moulds may be used for each of die cushion Individual, and in the most multiple cushion pad, the die buffer stroke of each can be set individually.

In the die cushion of the forcing press of the another aspect according to the application, it is therefore preferable to multiple Each of cushion pad arranges two or more die buffer force producers, and corresponding to multiple respectively From multiple cushion pad position detectors of die buffer force producer be set, multiple slow to be detected as Each in the position of two or more die buffer force producers that each of die head is arranged, Or each the neighbouring die buffer position in detection position.It is further preferred that corresponding to multiple respectively From multiple position control compensators of die buffer force producer be set, with based on from die buffer The single die buffer position of each corresponding to multiple cushion pads of position command device output Order and and detected by the corresponding cushion pad position detector in multiple cushion pad position detectors Die buffer position control each of multiple respective die buffer force producer, with independently Move up and down each of multiple cushion pad.

According to the another aspect of the application, die cushion can be as multiple respective cushion pads Multiple die cushions use.Therefore, each of die cushion can use different moulds Tool, and in the most multiple cushion pad, the die buffer stroke of each can be set individually.Especially, The position of each cushion pad can be controlled, so that each cushion pad will not tilt.

The die cushion of the forcing press of the another aspect according to the application, including multiple die buffers Force detector, detection is applied to the die buffer power of multiple respective cushion pad.At die cushion In, each of multiple die buffer controllers includes die buffer force controller, this die buffer power Controller includes die buffer power command device, exports each independent corresponding to multiple cushion pads Die buffer power order, to multiple die buffer force producers, also includes die buffer power control and compensation Device, based on the die buffer power order exported from die buffer power command device and is delayed by multiple moulds The die buffer power of the corresponding die buffer force detector detection in impulse force detector controls multiple Each of die buffer force producer, to apply independent die buffer power in multiple cushion pads Corresponding cushion pad.

According to the another aspect of the application, die cushion can be as multiple respective cushion pads Multiple die cushions use.Therefore, each of die cushion can use different moulds Tool, and in the most multiple cushion pad, each die buffer stroke and die buffer power can be by individually Arrange.Therefore, die cushion enables to a forcing press and performs stamping with multiple steps, The n-th punching press being such as stamped in n-th mould from the first time first mould, or Deeper punching press can be performed, and therefore can be used for different types of shaping.

In the die cushion of the forcing press of the another aspect according to the application, it is therefore preferable to multiple Each of cushion pad arranges two or more die buffer force producers, and is corresponding to many Multiple cushion pad force detectors of individual respective die buffer force producer are set, with detection from multiple Each die buffer power that respective die buffer force producer is applied on multiple cushion pad.The most excellent Selection of land, the die buffer power command device of each corresponding to multiple cushion pads exports corresponding to layout Each of two or more die buffer force producers in each of cushion pad respective Die buffer pressure command, and be multiple die buffer power control and compensation device based on from mould delay Impulse force command device output die buffer power order and by multiple die buffer force detectors The die buffer power of corresponding die buffer force detector detection controls multiple respective die buffer Force producer, to apply independent die buffer power to the corresponding cushion pad in multiple cushion pads.

Another aspect according to the application, it is possible to each in multiple cushion pads is accurately applied Corresponding to the desired die buffer power of respective die buffer power order, and especially, it is possible to right Each position in being even arranged in a cushion pad at die buffer force producer is accurately executed Add desired die buffer power.

In the die cushion of the forcing press of the another aspect according to the application, preferably correspond to The die buffer power command device of each in multiple cushion pads, it is possible to arrange corresponding to each buffering Pad general die buffer power order, for be arranged in cushion pad each in two or more The respective die buffer power order of each of multiple die buffer force producers, and export set Fixed die buffer power order.

Another aspect according to the application, it is possible to apply multiple cushion pads to delay corresponding to general mould The uniform die buffer power of impulse force order, or can accurately apply desired die buffer power to It is provided with each position of die buffer force producer, and especially, it is possible to delay according to by mould The die buffer power order that impulse force command device is arranged is suitably to apply die buffer power.

Owing to the application allows that die cushion mechanical independently controls multiple cushion pad with limiting, The most described die cushion is capable of: do not relying on deformation or the centering of the pillow such as forcing press In the case of, improve the function applying uniform die buffer power；Between multiple cushion pads with than The higher accurate synchronization of precision of mechanical synchronization；And as multiple die cushions, it is possible to many Each of individual cushion pad arranges die buffer stroke and die buffer power.

Accompanying drawing explanation

Fig. 1 is that the structure of the first embodiment of the die cushion of the forcing press according to the application regards Figure；

Fig. 2 is the first embodiment of the die buffer controller in the die cushion shown in Fig. 1 Block diagram；

Fig. 3 A and 3B respectively treats front view and the side view of moulding material (product)；

Fig. 4 is when die buffer power is applied to the product of the shape shown in Fig. 3 A and 3B, each physics The oscillogram of the change of amount.The part A of Fig. 4 illustrates slide position and the oscillogram of die buffer position, The part B of Fig. 4 illustrates the oscillogram of the die buffer load in each being applied to left and right cushion pad；

Fig. 5 is that the structure of the second embodiment of the die cushion of the forcing press according to the application regards Figure；

Fig. 6 is the second embodiment of the die buffer controller in the die cushion shown in Fig. 5 Block diagram；

Fig. 7 is the major part of the 3rd embodiment of the die cushion of the forcing press according to the application Topology view；

Fig. 8 is the 3rd embodiment of the die buffer controller in the die cushion shown in Fig. 7 The block diagram of major part, especially, for the block diagram of die buffer positioner；And

Fig. 9 is the 3rd embodiment of the die buffer controller in the die cushion shown in Fig. 7 The block diagram of major part, especially, for the block diagram of die buffer pressure controller.

Detailed description of the invention

In conjunction with accompanying drawing, die cushion excellent of forcing press according to the application is hereinafter described Select embodiment.

(structure of the die cushion of first embodiment)

Forcing press 100 shown in Fig. 1 includes framework, this framework include rest the head on (or lathe bed) 102, post 104, And top 106, with by the targeting part 108 that is arranged in post 104 in the directed movement of vertical direction Slide block 110.Slide block 110 realizes moving on vertical direction by crank mechanism in FIG, this crank Structure includes, by driving means (not shown), rotary driving force is delivered to crank axle 112 thereon.

Crank axle 112 includes crank angle detector 116 and the crankangle detecting the angle of crank axle 112 Speed detector 118.Upper mold 120 is installed on slide block 110, lower mold 122 be arranged on bed 102 ( On its pillow).

Die cushion 200 includes: blank holder (edge-pressing board) 202；Multiple cushion pad 210-1 arrive 210-N (N is the integer of two or more), described cushion pad supports blank holder by multiple cushion pins 204 202；Multiple hydraulic cylinder 220-1 to 220-N, it supports cushion pad 210-1 to 210-N respectively； Multiple hydraulic circuit 250-1 to 250-N, it drives described hydraulic cylinder 220-1 to 220-N respectively；Mould Tool buffer control unit 300 (seeing accompanying drawing 2), it controls hydraulic circuit 250-1 to 250-N.

Hydraulic cylinder 220-1 to 220-N and hydraulic circuit 250-1 to 250-N is as multiple die buffers Force producer, individually moves up and down described cushion pad 210-1 to 210-N, and individually to Cushion pad 210-1 to 210-N applies die buffer power.

Additionally, be respectively corresponding to multiple cushion pad positions of multiple hydraulic cylinder 220-1 to 220-N Detector 224-1 to 224-N is for detecting the respective piston of respective hydraulic cylinder 220-1 to 220-N respectively Bar 220a-1 to 220a-N is in the position of bearing of trend, respective as cushion pad 210-1 to 210-N Position (cushion pad position) on direction of improvement.

Blank holder 202 is arranged between upper mold 120 and lower mold 122.The downside of blank holder is by cushion pad 210-1 to 210-N is supported by multiple cushion pins 204, and material 203 is arranged at (making contact) The upside of blank holder.Blank holder 202 can be by separately with corresponding to multiple cushion pad 210-1 to 210-N.

Subsequently, it will describe and drive the hydraulic circuit 250-1 of hydraulic cylinder 220-1 to 220-N to arrive respectively The structure of each of 250-N.

Hydraulic circuit 250-1 to 250-N includes accumulator 252-1 to 252-N, hydraulic pump/horse respectively Reach 254-1 to 254-N, be connected to the corresponding rotary shaft of respective hydraulic pump/motor 254-1 to 254-N Servo motor 256-1 to 256-N；Detection servo motor 256-1 to 256-N respective respective drive axle Servo motor angular velocity detector 258-1 to the 258-N of angular velocity (servo motor angular velocity omega), releases Pressure valve 260-1 to 260-N, check-valves 262-1 to 262-N, and die buffer pressure detector 264-1 To 264-N, each of which is equal to die buffer force detector.

Owing to each hydraulic circuit 250-1 to 250-N has identical structure, liquid is described below Volt circuit 250-1.

Described accumulator 252-1, applies low pressure wherein, serves not only as a case, also simultaneously For the oil being in substantially constant low-pressure is supplied to hydraulic cylinder 220-1's by check-valves 262-1 Uplifted side booster cavity (producing the booster cavity of compensator or trimmer pressure) 220b-1, so that when controlling die buffer During pressure, the pressure in cavity can rise easily.

One port (outlet) of hydraulic pump/motor 254-1 increases with the uplifted side of hydraulic cylinder 220-1 Pressure chamber 220b-1 connects, and other ports are connected with accumulator 252-1.

Pressure relieving valve 260-1 as the device avoiding hydraulic press to destroy, its when abnormal pressure produces or Inoperative and action time that cause abnormal pressure occurs suddenly of controlling due to die buffer power.This Outward, 220c-1 and accumulator 252-1 is even for the decline side booster cavity (pad side booster cavity) of hydraulic cylinder 220-1 Connect.

Die buffer pressure detector 264-1 detection acts on the uplifted side of described hydraulic cylinder 220-1 The pressure of booster cavity 220b-1, servomotor angular speed detector 258-1 detection servo motor 256-1's Angular speed.

(die buffer power control principle)

Owing to die buffer power can be by the pressure in the uplifted side pressure chamber 220b-1 of hydraulic cylinder 220-1 Power and the product representation of cylinder body area, therefore control die buffer power and mean to control hydraulic cylinder 220-1 Uplifted side pressure chamber 220b-1 in pressure.

The pressure controlled static characteristic of die buffer can pass through expression (1) and (2) represent.

P=∫ K ((v A-k1Q ω)/V) dt... (1)

T=k2 PQ/ (2 π) ... (2), wherein

A is the cross-sectional area that die buffer pressure occurs the hydraulic cylinder of side；

V is the volume that die buffer pressure occurs the hydraulic cylinder of side；

P is die buffer pressure；

T is the torque of electronic (servo) motor；

I is the moment of inertia of servo motor；

DM is the viscosity factor of servo motor；

FM is the friction torque of servo motor；

Q is the release volume of hydraulic motor；

F_slideFor the power being applied on the piston rod of hydraulic cylinder by slide block；

V is the speed of pad when pad is applied pressure by forcing press；

M is piston rod and the inertia mass of pad of hydraulic cylinder；

DS is the viscosity factor of hydraulic cylinder；

FS is the frictional force of hydraulic cylinder

ω is the angular velocity of the servo motor rotated by oil pressure；

K is the elastic volume factor of hydraulic oil；And

K1 and k2 is proportionality constant.

It addition, the pressure controlled dynamic characteristic of die buffer can reach formula (3) by table below (4), represent together with expression formula (1) and (2).

PA-F=M dv/dt+DS v+fS... (3)

T-k2 PQ/ (2 π)=I d ω/dt+DM ω+fM... (4)

Above-mentioned expression formula (1) is as follows to the implication of (4): from slide block 110 and via cushion pad In the uplifted side booster cavity 220b-1 of the force compresses hydraulic cylinder 220-1 that 210-1 is delivered to hydraulic cylinder 220-1 Oil, thus produce die buffer pressure；Meanwhile, die buffer pressure makes hydraulic pump/motor 254-1 As when the rotary shaft torque of the generation in hydraulic pump/motor 254-1 and the driving of servo motor 256-1 The upper of die buffer pressure thus avoided by the hydraulic motor rotating servo motor 256-1 when torque is identical Rise；Therefore, die buffer pressure (die buffer power) is according to the driving torque of servo motor 256-1 Determine.

(first embodiment of die buffer controller)

Fig. 2 is to represent the die buffer controller 300 in the die cushion 200 shown in Fig. 1 The block diagram of first embodiment.

Die buffer controller 300 includes the mould of the number corresponding to cushion pad 210-1 to 210-N The number of buffer control unit 300-1 to 300-N.Especially, the die buffer control in first embodiment Device 300 processed illustrates with this situation, and wherein torque command n-selector 340 selects die buffer controller 300-1 using by multiple cushion pad 210-1 to 210-N as (multiaxis (N axle) wheel synchronization type) servo Die cushion controls.

Owing to each of multiple die buffer controller 300-1 to 300-N has identical merit Can, the die buffer controller 300-1 that control cushion pad 210-1 is described below.

Die buffer controller 300-1 includes die buffer positioner 310, signal computer 311, die buffer pressure controller 320, and torque command selector 330.

Signal computer 311 is from crank angle detector 116 and crank angular velocity detector 118 difference Receive crank angle signal and crank angular velocity signal.Described signal computer 311 is believed by degree in crank angle Number calculate the slide position signal representing slide position, and by defeated for the slide position signal that calculates Go out and select to die buffer positioner 310, die buffer pressure controller 320 and dtc signal Device 330.Signal computer also calculates the ram speed representing ram speed from crank angular velocity signal Signal, and export the slider velocity signal after calculating to die buffer pressure controller 320.

According to the slide position signal received, torque command selector 330 determines that slide block is in non- Work process region is in work process region.When slide block 110 is in inoperative process area, Select the die buffer position control state controlled by die buffer positioner 310.At slide block When work process region, select the die buffer power control controlled by die buffer pressure controller 320 State processed.

(die buffer position control)

Die buffer positioner 310 includes position command device 312, and and die buffer position Put multiple position control compensator 314-1 to 314-N of command device equivalent, described position command device 312 are received the cushion pad position of expression cushion pad position by cushion pad position detector 224-1 to 224-N Detection signal, to use this signal as initial value during generation position command.Described position command fills Put 312 output universal location orders (die buffer position command) to control cushion pad position (buffering The position of each of pad 210-1 to 210-N), thus stop is to terminate mould bottom slide block 110 arrives After tool cushion effect controls, product can be removed, and each of cushion pad 210-1 to 210-N It is maintained at the initial position that cushion pad is standby.

Under die buffer position control situation, position control compensator 314-1 to 314-N basis Position command device 312 output universal location order and by respective cushion pad position detector The cushion pad position detection signal that 224-1 to 224-N produces, generates multiple torque command T₁To T_N, and And the torque command T that output generates₁To T_NTo torque command selector 330.Described torque command selects Device 330, when die buffer position control state, selects by each position control and compensation device 314-1 The torque command T generated to 314-N₁To T_N, and exported by servo amplifier 360-1 to 360-N respectively Torque command T₁To T_NTo servo motor 256-1 to 256-N.

Correspondingly, the driving of servo motor 256-1 to 256-N is controlled, and has and be connected to phase The hydraulic pump/motor 254-1 of the respective drive shaft on servo motor 256-1 to 256-N answered arrives 254-N (see Fig. 1) is rotated respectively by the driving torque from servo motor 256-1 to 256-N, with Pressure oil is provided to arrive to the uplifted side booster cavity 220b-1 of respective hydraulic cylinder 220-1 to 220-N respectively In 220b-N.Hydraulic cylinder 220-1 to 220-N has the respective uplifted side pressure chamber supplied by pressure oil 220b-1 to 220b-N, hydraulic cylinder 220-1 to 220-N pass through respective piston rod 220a-1 to 220a-N Rise described cushion pad 210-1 to 210-N respectively.Therefore, each cushion pad 210-1 to 210-N Position (die buffer position) can be controlled.Preferably, position control compensator 314-1 to 314-N Receive respectively and (according to the subsequent modification of applicant, unified to be revised as speed by servo motor angular velocity？) The servo motor of each servo motor 256-1 to 256-N that detector 258-1 to 258-N produces respectively Angular velocity signal, and cushion pad 210-1 is arrived at ascent direction according to servo motor angular velocity signal 210-N carries out position control to ensure the dynamic stability in position control.

Although as it has been described above, the independently controlled multiple cushion pads of die buffer positioner 310

The die buffer position of each of 210-1 to 210-N, the position of each cushion pad is based on universal location Order is accurately controlled.Therefore, cushion pad has general die buffer stroke, and works as cushion pad It is taken as substantially one cushion pad and controls the position of cushion pad constantly.

(die buffer pressure or the control of die buffer power)

The die buffer pressure controller 320 being equal to die buffer force controller includes being equal to mould Have the pressure command device 322 of cushion effect command device, and Stress control compensator 324-1 arrives 324-N is equal to multiple die buffer power control and compensation device.

Pressure command device 322 receives the slide position signal calculated by signal computer 311 with root Position output pressure order P according to slide block 110₁To P_N.Pressure command device 322 is such as according to slide block position Confidence number output substep pressure command P₁To P_N, and control pressure command P₁To P_NOutput time or class Like parameter.

Pressure command P exported by pressure command device 322₁To PN, can be to multiple hydraulic cylinders 220-1 to 220-N (multiple cushion pad 210-1 to 210-N) is general, or respective and multiple hydraulic pressure Cylinder 220-1 to 220-N is correlated with.That is, described pressure command device 322 can arrange UP order, Or pressure command respectively is set for each hydraulic cylinder 220-1 to 220-N.And export setting Pressure command P₁To PN.Further, pressure command P₁To P_NIt is not limited to substep pressure command, permissible It is altered in steps according to die buffer position, or taper change.

Stress control compensator 324-1 to 324-N receive by die buffer pressure detector 264-1 to The pressure detecting signal that 264-N produces respectively is to control to be ordered by the pressure from pressure command device 322 Making the die buffer pressure indicated by P1 to PN, this pressure detecting signal indicates corresponding each hydraulic cylinder The pressure of uplifted side booster cavity 220b-1 to the 220b-N of 220-1 to 220-N.Preferably, Stress control Compensator 324-1 to 324-N receives and is produced respectively by servo motor angular velocity detector 258-1 to 258-N The servo motor angular velocity signal of raw each servo motor 256-1 to 256-N, with based on servo motor angle Rate signal controls die buffer pressure, thus ensures the dynamic stability of die buffer pressure.

When by die buffer position control state or die buffer spare space (holding) controlled state When being switched to die buffer pressure control state, compensator 324-1 to 324-N is the most defeated for Stress control Go out torque command T₁To T_N, to torque command selector 330, wherein said torque command T₁To T_NUse Pressure command P₁To P_N, pressure detecting signal, servo motor angular velocity signal and slider velocity signal meter Form.Described torque command selector 330, when die buffer Stress control, selects respectively by pressing The torque command T that power control and compensation device 324-1 to 324-N produces₁To T_NAnd amplified by servo respectively Device 360-1 to 360-N is by torque command T₁To T_NServo motor 256-1 to 256-N is arrived in output.

Correspondingly, Stress control compensator 324-1 to 324-N controls servo motor 256-1 respectively and arrives The driving torque of 256-N, to control to be executed by hydraulic pump/motor 254-1 to 254-N (seeing accompanying drawing 1) It is added to the pressure of uplifted side booster cavity 220b-1 to the 220b-N of each hydraulic cylinder 220-1 to 220-N, thus Control die buffer power produced by each of hydraulic cylinder 220-1 to 220-N.Hydraulic pump/motor 254-1 to 254-N be respectively arranged be connected respectively to servo motor 256-1 to 256-N drive shaft.

When die buffer Stress control, when described slide block 110 with material 203 (and blank holder 202) stop or operationally, servo motor 256-1 to 256-N are dropped to bottom contact after collision Torque outbound course and the velocity attitude of generation contrary.That is, each cushion pad 210-1 to 210-N The energy obtained from slide block 110 makes pressure oil from the uplifted side supercharging of each hydraulic cylinder 220-1 to 220-N Chamber 220b-1 to 220b-N flows to hydraulic pump/motor 254-1 to 254-N, thus hydraulic pump/motor 254-1 to 254-N is as hydraulic motor effect.Servo motor 256-1 to 256-N is by hydraulic pump/motor 254-1 to 254-N drives respectively using as electromotor effect.Servo motor 256-1 to 256-N produces Electric energy is regenerated in alternating current power supply 364 by unidirectional current feeding mechanism 362, plays regenerative electric energy to provide Electric energy is to the effect of servo amplifier 360-1 to 360-N.

The die buffer power of each of multiple cushion pad 210-1 to 210-N is by die buffer pressure Controller 320 mechanical limits the independent control in ground.Correspondingly, export general when pressure command device 322 Pressure command P₁To P_NTime, uniform die buffer pressure is applied to multiple cushion pad 210-1 to 210-N On.If additionally, pressure command device 322 exports independent pressure command P₁To P_N, it is desirable to corresponding In pressure command P₁To P_NDie buffer power can be applied to cushion pad 210-1 to 210-N's accurately On each.

Fig. 3 A and 3B illustrates the material 203 being in forming process centre that the dotted portion of Fig. 1 is irised out Zoomed-in view.Fig. 3 A and 3B is respectively front view and the side view of product.

As shown in Figure 3A, when material 203 by diagram shape have left side shape bigger than right side shape Shape a product all moulds (mold 120 and lower mold 122) formed time, the pressure of applying Power is supported on the direction, both sides of material 203 and tilts.In such a situation it is preferred to arrive at cushion pad 210-1 Different die buffer power (about such as each cushion pad being distinguished) is applied in each of 210-N Rather than multiple cushion pad 210-1 to 210-N are applied uniform die buffer power.

Fig. 4 is when die buffer power is applied to the product of the shape shown in Fig. 3 A and 3B, each thing The oscillogram of the change of reason amount.The part A of Fig. 4 illustrates slide position and the waveform of die buffer position Figure, the part B of Fig. 4 illustrates the waveform of the die buffer load in each being applied to left and right cushion pad Figure.

Product in the diagram shape bigger than right side shape to the left side shape shown in Fig. 3 carries out pressure During shaping, as shown in (B) part of Fig. 4, to each left and right cushion pad, die buffer power is controlled System is so that the mould that the die buffer duty factor that is applied to left cushion pad is applied to right cushion pad delays Punching load is big.In this way, the die buffer pressure quilt each separate cushion pad applied Mechanical limits that ground is independent to be controlled, and to each cushion pad it is anticipated that (accurate According to order instruction) apply die buffer pressure be possibly realized.Therefore, it can be greatly improved shaping Property.

(structure of the die cushion of the second embodiment)

Fig. 5 is that the structure of the second embodiment of the die cushion of the forcing press according to the application regards Figure.The part total with the first embodiment of the die cushion of the forcing press shown in Fig. 1 by and Fig. 1 Identical reference instruction, and be no longer repeated in describing.

Although the die cushion of the forcing press in first embodiment arrives to multiple cushion pad 210-1 The offer die buffer position control of 210-N independence and die buffer power control, its die cushion Play the effect of a die cushion with multiple cushion pad.On the contrary, the second embodiment The die cushion of forcing press serves not only as a die cushion and uses, also according to application conduct Die cushion corresponding to the number of cushion pad uses, and therefore, the second embodiment is different from first The place of embodiment is that the second embodiment is effective to multiple shaping.

In the second embodiment shown in Fig. 5, multiple independent upper mold 120-1 to 120-N and lower mold 122-1 to 122-N, is respectively corresponding to multiple cushion pad 210-1 to 210-N, is connected to slide block 110 With on bed 102.

Additionally, multiple blank holder 202-1 to 202-N are passed through corresponding by multiple cushion pad 210-1 to 210-N Cushion pins 204 independently support.

As it is shown in figure 5, upper mold 120-1 and lower mold 122-1 and upper mold 120-N and lower mold 122-N exist In mold shape different, and each of multiple cushion pad 210-1 to 210-N has individually (different) Die buffer stroke.

(the die buffer controller of the second embodiment)

Fig. 6 is the second reality of the die buffer controller 300 of the die cushion 200 shown in Fig. 5 Execute the block diagram of example.

In figure 6, die buffer controller 300 includes corresponding to multiple cushion pad 210-1 to 210-N Multiple die buffer controller 300-1 to 300-N.In particular, the of die buffer controller 300 Die buffer controller 300-1 is selected to arrive for torque command n-selector 340 shown in two embodiments The situation of 300-N, thus control multiple cushion pad as N number of respective servo die buffer unit 210-1 to 210-N.

User can be reached by switching torque command n-selector 340 to select first shown in Fig. 2 Shown in the function worked as only one servo die buffer unit in embodiment or Fig. 6 second is real Execute the function worked as N number of servo die buffer unit of example.Owing to multiple die buffers control Each of device 300-1 to 300-N has identical function, the most only describes and controls cushion pad The die buffer controller 300-1 of 210-1.

Die buffer controller 300-1 includes die buffer positioner 310-1, die buffer pressure Force controller 320-1 and torque command selector 330-1.

Die buffer positioner 310-1 includes the position being equal to die buffer position command device Put command device 312-1 and position control compensator 314-1.Position command device 312-1 is by cushion pad The 224-1 of position detector receives the cushion pad position detection signal representing cushion pad position should to utilize Signal produces initial value when generating position command.Described position command device 312-1 not only makes to work as Bottom slide block 110 arrival, stop is after terminating the control of die buffer power, and product can be removed, also Output universal location order (die buffer position command) is to control cushion pad position (cushion pad 210-1 The position of each to 210-N), thus, and each holding of cushion pad 210-1 to 210-N At the initial position that cushion pad is standby.

Under die buffer position control situation, position control compensator 314-1 is according to position command Device 312-1 output position command and by cushion pad position detector 224-1 produce cushion pad Position detection signal, generates torque command T₁, and export the torque command T generated₁Order to torque Make selector 330-1.Described torque command selector 330-1 is in the feelings of die buffer position control state Under shape, select the torque command T generated by each position control and compensation device 314-1₁, and amplified by servo Device 360-1 exports torque command T₁To T_NTo servo motor 256-1.

Correspondingly, the driving of servo motor 256-1 is controlled, and has and be connected to watch accordingly Take the hydraulic pump/motor 254-1 (see Fig. 5) of drive shaft on motor 256-1 by from servo motor The driving torque of 256-1 rotates, to provide pressure oil to the uplifted side booster cavity of hydraulic cylinder 220-1 In 220b-1.Hydraulic cylinder 220-1 have the uplifted side pressure chamber 220b-1 that supplied by pressure oil to 220b-N, hydraulic cylinder 220-1 rise described cushion pad 210-1 by piston rod 220a-1.Therefore, slow The position (die buffer position) of die head 210-1 can be controlled.Preferably, position control compensates By servo motor angular velocity, (according to the subsequent modification of applicant, unification is revised as speed in device 314-1 reception Rate？) the servo motor angular velocity signal of servo motor 256-1 that produces of detector 258-1, and root At ascent direction, cushion pad 210-1 is carried out position control to ensure position according to servo motor angular velocity signal Put the dynamic stability in control.

As it has been described above, die buffer positioner 310-1 can independently accurately control multiple slow The position of the cushion pad 210-1 in die head 210-1 to 210-N, the position of each cushion pad is based on general Position command is accurately controlled.Similarly, die buffer positioner 310-N can be the most accurate Ground controls the position of the cushion pad 210-N in multiple cushion pad 210-1 to 210-N.

The die buffer pressure controller 320-1 being equal to die buffer force controller includes being equal to The pressure command device 322-1 of die buffer power command device, and Stress control compensator 324-1 etc. It is same as die buffer power control and compensation device.

Pressure command device 322-1 receive the slide position signal that calculated by signal computer 311 with Position output pressure order according to slide block 110.Pressure command device 322-1 is such as according to slide position Signal output substep pressure command, and control output time or the similar parameters of pressure command.

Stress control compensator 324-1 receives the pressure produced by die buffer pressure detector 264-1 Power detection signal is to control to be delayed by the mould indicated by the pressure command from pressure command device 322-1 Stamping press, the pressure of the uplifted side booster cavity 220b-1 of this pressure detecting signal indicator solution cylinder pressure 220-1. Preferably, Stress control compensator 324-1 receives by servo motor angular velocity detector 258-1 generation The servo motor angular velocity signal of servo motor 256-1, to control based on servo motor angular velocity signal Die buffer pressure, thus ensure the dynamic stability of die buffer pressure.

When by die buffer position control state or die buffer spare space (holding) controlled state When being switched to die buffer pressure control state, Stress control compensator 324-1 exports torque command T₁ To torque command selector 330-1, wherein said torque command T₁Use pressure command, pressure detecting letter Number, servo motor angular velocity signal and slider velocity signal calculate and form.Described torque command selector 330-1, when die buffer Stress control, selects the torque life produced by Stress control compensator 324-1 Make T₁And by servo amplifier 360-1 by torque command T₁Servo motor 256-1 is arrived in output.

Correspondingly, Stress control compensator 324-1 controls the driving torque of servo motor 256-1, with Control to be applied to the uplifted side supercharging of hydraulic cylinder 220-1 by hydraulic pump/motor 254-1 (seeing accompanying drawing 1) The pressure of chamber 220b-1, thus control die buffer power produced by hydraulic cylinder 220-1.Hydraulic pump/horse Reach 254-1 and be provided with the drive shaft being connected to servo motor 256-1.

As it has been described above, die buffer positioner 310-1 can independently accurately control multiple slow The die buffer power of the cushion pad 210-1 in die head 210-1 to 210-N.Similarly, die buffer position Put controller 310-N and can independently accurately control the cushion pad in multiple cushion pad 210-1 to 210-N The die buffer power of 210-N.

Therefore, when pressure forming has the height product of change, by using as shown in Figure 5 Each there is the mould of different die buffer strokes, the die cushion in the second embodiment Can be to each cushion pad as independent die cushion effect.

Now, die buffer controller 300 can use by use identical hardware with corresponding to The method that in software, the quantity of cushion pad configures the quantity of die buffer controller, or use employing not Same hardware configures the method for the quantity of die buffer controller with the quantity corresponding to cushion pad.

(structure of the die cushion of the 3rd embodiment)

Fig. 7 is the main portion of the 3rd embodiment of the die cushion of the forcing press according to the application The topology view divided.The first and of the die cushion of the forcing press being respectively shown in Fig. 1 and Fig. 5 The part that two embodiments are identical, uses the reference identical with Fig. 1 and Fig. 5 to indicate, and the heaviest Multiple detailed description.

Buffering in the pressure buffer device of the forcing press in each of the first and second embodiments The number of pad 210-1 to 210-N, arrives with the hydraulic press 220-1 driving cushion pad 210-1 to 210-N The number of 220-N is identical, also the most identical with the number of hydraulic circuit 250-1 to 250-N.On the contrary, The difference of the die cushion of the forcing press in the 3rd embodiment shown in Fig. 7 is, multiple hydraulic pressure Cylinder 220-1LF (220-1LB) and 220-1RF (220-1RB) and multiple hydraulic circuit 250-1LF (250-1LB) it is supplied in multiple cushion pad 210-1 to 210-N with 250-1RF (250-1RB) One cushion pad (being cushion pad 210-1 in the example in figure 7).

As it is shown in fig. 7, a cushion pad 210-1 in multiple cushion pad 210-1 to 210-N is by four Individual hydraulic cylinder 220-1LF (220-1LB) and 220-1RF (220-1RB) support moving up and down. Although four hydraulic cylinders are respectively arranged the left front in cushion pad 210-1, left back, right front, the right side Rear, Fig. 7 illustrate only the hydraulic cylinder 220-1RF before left front hydraulic cylinder 220-1LF and the right side.

Multiple hydraulic circuit 250-1LF (250-1LB) and 250-1RF (250-1RB) drive liquid respectively Cylinder pressure 220-1LF (220-1LB) and 220-1RF (220-1RB) and and Fig. 5 described in hydraulic pressure electricity Road 250-1 has identical configuration.Before Fig. 7 only illustrates the left front hydraulic cylinder 220-1LF of driving and the right side Hydraulic cylinder 220-1LF and 220-1RF of hydraulic cylinder 220-1RF.

Four hydraulic cylinder 220-1LF (220-1LB) and 220-1RF (220-1RB) inside include respectively Cushion pad position detector 224-1LF (224-1LB) and 224-1RF (224-1RB).Each delays Die head position detector 224-1LF (224-1LB) and 224-1RF (224-1RB) include being fixed on mould The magnetic scale of cushioning frame 210 (in cylinder side), and read the magnetic detection head of magnetic scale, its Fix on the piston rod.

Correspondingly, cushion pad position detector 224-1LF (224-1LB) and 224-1RF (224-1RB) four hydraulic cylinder 220-1LF (220-1LB) and 220-1RF can be detected respectively (220-1RB) position of the difference of piston rod, maybe can detect four positions in cushion pad 210-1 Respective height and position (cushion pad position), at each of four positions connect have piston The tip of bar.Although cushion pad position detector 224-1LF (224-1LB) and 224-1RF (224-1RB) it is respectively arranged at hydraulic cylinder 220-1LF's (220-1LB) and 220-1RF (220-1RB) Link position, cushion pad position detector can also be arranged near corresponding hydraulic cylinder.

Hydraulic circuit 250-1LF (250-1LB) and 250-1RF (250-1RB) includes that mould delays respectively Stamping press detector 264-1LF (264-1LB) and 264-1RF (264-1RB), it detects applying respectively Pressure to each uplifted side booster cavity of hydraulic cylinder 220-1LF (220-1LB) and 220-1RF (220-1RB) Power.

Fig. 8,9 each be the die buffer controller in the die cushion shown in Fig. 7 The block diagram of major part of the 3rd embodiment, Fig. 8 illustrates die buffer positioner, and Fig. 9 illustrates Die buffer pressure controller.

As shown in Figure 8, die buffer positioner 310-1 includes being equal to die buffer position life Make the position command device 312-1 of device, and include four position control compensator 314-1LF, The position control compensator 314-1 of 314-1LB, 314-1RF and 314-1RB.

Position command device 312-1 output universal location order is to each position control compensator 314-1LF, 314-1LB, 314-1RF and 314-1RB.

Described four position controls compensator 314-1LF, 314-1LB, 314-1RF and 314-1RB divide Do not receive from cushion pad position detector 224-1LF, 224-1LB, 224-1RF and 224-1RB Represent that (position in cushion pad 210-1, connects respective four positions in cushion pad 210-1 in this place Connect the piston rod of each hydraulic cylinder 220-1LF, 220-1LB, 220-1RF and 220-1RB) cushion pad Position detection signal, and universal location order.Position control compensator 314-1LF, 314-1LB, 314-1RF and 314-1RB is based on the position command exported by position command device 312-1 with by each buffering The cushion pad position inspection that pad position detector 224-1LF, 224-1LB, 224-1RF and 224-1RB produce Survey signal, produce torque command, thus drive four hydraulic circuit 250-1LF, 250-1LB, Each servo motor 256-1 in 250-1RF and 250-1RB.

Based on by each position control and compensation device 314-1LF, 314-1LB, 314-1RF and 314-1RB institute The corresponding torque command produced controls the torque of each servo motor 256-1, thus controls buffering The position of pad 210-1.Preferably, position control compensator 314-1LF, 314-1LB, 314-1RF and 314-1RB receives the corresponding servo motor angular velocity signal of each servo motor 256-1, and based on phase The servo motor angular velocity signal answered realizes for cushion pad 210-1 in the position control of direction of improvement, To ensure the dynamic stability of position control.

Correspondingly, die buffer positioner 310-1 can be accurate according to the instruction of position command Control the position of cushion pad 210-1, to keep the depth of parallelism of cushion pad 210-1 simultaneously.Similarly, mould Buffer position controller 310-N (not shown) can accurately control buffering according to the instruction of position command The position of pad 210-N, keeps putting down of the cushion pad 210-N in multiple cushion pad 210-1 to 210-N simultaneously Row degree.

As it is shown in figure 9, die buffer pressure controller 320-1 includes being equal to die buffer power order The pressure command device 322-1 of device, and include four Stress control compensator 324-1LF, The Stress control compensator 324-1 of 324-1LB, 324-1RF, 324-1RB.

Pressure command device 322-1 output UP order or independent pressure command to four liquid Each of air cylinder 220-1LF (220-1LB) and 220-1RF (220-1RB).Pressure command device Pressure command to be exported for 322-1 possibly for multiple hydraulic motor 220-1LF (220-1LB) and 220-1RF (220-1RB) is general, or and multiple hydraulic motor 220-1LF (220-1LB) and 220-1RF (220-1RB) is individually correlated with.It is to say, pressure command device 322-1 can be each Individual hydraulic cylinder 220-1LF (220-1LB) and 220-1RF (220-1RB) setting general-purpose pressure command, or Independent pressure order, and the pressure command set by output.

Four Stress control compensator 324-1LF, 324-1LB, 324-1RF and 324-1RB receive Respectively from die buffer pressure detector 264-1LF, 264-1LB, 264-1RF and 264-1RB phase The pressure detecting signal answered, with as indicated by the pressure command from pressure command device 322-1 Equally controlling die buffer pressure, wherein said pressure detecting signal is shown that being applied to each hydraulic pressure The pressure of the uplifted side pressure chamber of cylinder 220-1LF (220-1LB) and 220-1RF (220-1RB).

Stress control compensator 324-1LF, 324-1LB, 324-1RF and 324-1RB based on from The pressure command of pressure command device 322-1 and respectively from hydraulic cushion pressure detector 264-1LF, The pressure detecting signal of 264-1LB, 264-1RF and 264-1RB calculates corresponding torque command, with Drive the servo motor in each hydraulic circuit 250-1LF, 250-1LB, 250-1RF and 250-1RB 256-1。

Based on by each Stress control compensator 314-1LF, 314-1LB, 314-1RF and 314-1RB institute The corresponding torque command calculated controls the torque of each servo motor 256-1, thus controls to apply Die buffer in each hydraulic cylinder 220-1LF (220-1LB) and 220-1RF (220-1RB) Power.Preferably, Stress control compensator 314-1LF, 314-1LB, 314-1RF and 314-1RB receive The corresponding servo motor angular velocity signal of each servo motor 256-1, and based on corresponding servo horse Reach angular velocity signal and control die buffer pressure, to ensure the dynamic stability of position control.

Correspondingly, die buffer pressure controller 320-1 can independently and accurately for supporting delay Each hydraulic cylinder 220-1LF (220-1LB) of die head 210-1 controls to execute to 220-1RF (220-1RB) The die buffer pressure being added on cushion pad 210-1.Similarly, die buffer controller 320-N is (not Illustrate) can be that each of two or more hydraulic cylinders supporting cushion pad 210-N is accurately controlled System is applied to the die buffer on the cushion pad 210-N among multiple cushion pad 210-1 to 210-N Power.

(other)

Although die buffer force producer in embodiments includes driving cushion pad to move up and down Hydraulic cylinder and drive hydraulic cylinder hydraulic circuit (hydraulic motor and servo motor), in addition, The structure of any generation die buffer power all can use, such as, use and include moving up and down cushion pad The structure of the mechanism of the servo motor of nut structure and driving nut structure；And use includes moving down The structure of the mechanism of the servo motor of the pinion and rack of dynamic cushion pad and drive gear teeth bar mechanism, Therefore the application can be used for any servo die buffer unit.

The application is not limited to the above embodiments, therefore, need not point out the think of without departing from the application Multiple change in the range of thinking is all possible.

Description of reference numerals

100: forcing press

110: slide block

116: crank angle detector

118: crank angular velocity detector

120,120-1 to 120-N: upper mold

122,122-1 to 122-N: lower mold

200: die cushion

202,202-1 to 202-N: blank holder

203: material

204: cushion pins

210,210-1 to 210-N: cushion pad

220-1 to 220-N, 220-1LF, 220-1LB, 220-1RF, 220-1RB: hydraulic cylinder

224-1 to 224-N, 224-1LF, 224-1LB, 224-1RF, 224-1RB: cushion pad Position detector

250-1 to 250-N, 250-1LF, 250-1LB, 250-1RF, 250-1RB: hydraulic pressure electricity Road

254-1 to 254-N hydraulic pump/motor

256-1 to 256-N: servo motor

258-1 to 258-N: servo motor angular velocity detector

264-1 to 264-N, 264-1LF, 264-1LB, 264-1RF, 264-1RB: mould delays Stamping press detector

300,300-1 to 300N: die buffer controller

310,310-1 to 310N: die buffer positioner

312,312-1 to 312N: mould command device

314-1 to 314-N: position control compensator

320,320-1 to 320N: die buffer pressure controller

322,322-1 to 322N: pressure command device

324-1 to 324-N: Stress control compensator

Claims

1. a die cushion for forcing press, including:

Multiple cushion pads；

Multiple die buffer force producers, support multiple respective cushion pad, and can go up independently The multiple respective cushion pad of lower movement, and produce die buffer power independently for each cushion pad； And

Die buffer controller, controls multiple die buffer force producer, many to move up and down independently Individual respective cushion pad, and produce die buffer power independently for each cushion pad.

The die cushion of forcing press the most according to claim 1,

Plurality of cushion pad has general die buffer stroke, and

Wherein said die buffer controller includes only one die buffer controller, with by multiple each Cushion pad control as a cushion pad.

The die cushion of forcing press the most according to claim 2, also includes:

Multiple cushion pad position detectors, detect the cushion pad position of multiple respective cushion pad,

Wherein said die buffer controller includes die buffer positioner, described die buffer position Putting controller and include die buffer position command device and multiple position control compensator, described mould delays Rush the position command device general die buffer position command of output, described position control compensator based on From the general die buffer position command of described die buffer position command device output with by multiple The cushion pad position of respective cushion pad position detector detection controls multiple respective die buffer Force producer, to move up and down each of multiple cushion pad independently.

The die cushion of forcing press the most according to claim 3,

Wherein each for multiple cushion pads arranges two or more die buffer force producers,

Wherein corresponding to the plurality of cushion pad position of the plurality of respective die buffer force producer Put detector to be set, to be detected as each two or more mould arranged of multiple cushion pad Each in the position of cushion effect generator, or detect the die buffer position near each position Put, and

Wherein corresponding to multiple position control compensator quilts of multiple respective die buffer force producers Arrange, with based on the general die buffer position life exported from described die buffer position command device Order and the mould detected by the corresponding cushion pad position detector in multiple cushion pad position detectors Buffer position controls multiple respective die buffer force producer, multiple slow to move up and down independently Each of die head.

5., according to the die cushion of the forcing press that any one is described in claim 2-4, also wrap Include:

Multiple die buffer force detectors, detection is applied to from multiple respective die buffer force producers The corresponding die buffer power of multiple cushion pads；

Wherein said die buffer controller includes die buffer force controller, described die buffer power control Device processed includes die buffer power command device and die buffer power control and compensation device, described die buffer power Command device exports general die buffer power order or the list of each corresponding to multiple cushion pads Solely die buffer power order is to multiple die buffer force producers, described die buffer power control and compensation device Based on the general die buffer power order exported from described die buffer power command device or independent mould Tool cushion effect order and the die buffer power by each detection of multiple die buffer force detectors Control each of multiple die buffer force producer, to apply independent die buffer power to multiple Each of cushion pad.

The die cushion of forcing press the most according to claim 5,

Two of which or more die buffer force producer are disposed in each of multiple cushion pad In,

Wherein the plurality of die buffer power corresponding to multiple respective die buffer force producers is examined Survey device is set, and is applied to multiple cushion pad with detection from multiple respective die buffer force producers Each die buffer power, and

Plurality of die buffer power control and compensation device, based on defeated from described die buffer power command device The general die buffer power order that goes out or individually die buffer power order and delayed by multiple moulds The die buffer power of each detection of impulse force detector controls multiple respective die buffer power and produces Raw device, to apply independent die buffer power to multiple respective cushion pads.

The die cushion of forcing press the most according to claim 6,

Wherein said die buffer power command device can arrange and lead to multiple die buffer force producers Die buffer power order, to two or more die buffers of each being arranged in cushion pad Die buffer power order that force producer is general or in each being arranged in cushion pad two Or the single die buffer power order of each of more die buffer force producer, and export Set die buffer power order.

The die cushion of forcing press the most according to claim 1,

Wherein said multiple cushion pad has single die buffer stroke, and

Wherein said die buffer controller includes multiple die buffer controller, and the plurality of mould delays Rush controller and control multiple respective cushion pads, and the plurality of die buffer controller controls multiple Respective cushion pad.

The die cushion of forcing press the most according to claim 8, also includes:

Multiple cushion pad position detectors, detect the position of multiple respective cushion pad；

Each of wherein said multiple die buffer controller includes die buffer positioner, institute State die buffer positioner and include die buffer position command device and position control compensator, institute State the die buffer position command device output single mould of each corresponding to multiple cushion pads Buffer position order, described position control compensator is based on defeated from described die buffer position command device The die buffer position command that goes out and by the corresponding cushion pad in multiple cushion pad position detectors It is corresponding that the position of cushion pad of position detector detection controls in multiple die buffer force producer Die buffer force producer, to move up and down the corresponding cushion pad in multiple cushion pad independently.

The die cushion of forcing press the most according to claim 9,

Wherein corresponding to the plurality of cushion pad position of the plurality of respective die buffer force producer Put detector to be set, to be detected as each two or more mould arranged of multiple cushion pad Each neighbouring die buffer in each in the position of cushion effect generator, or detection position Position, and

Wherein corresponding to multiple position control compensator quilts of multiple respective die buffer force producers Arrange, with based on export from die buffer position command device corresponding to each of multiple cushion pads Single die buffer position command and corresponding slow by multiple cushion pad position detectors The die buffer position of die head position detector detection controls the every of multiple die buffer force producer One, to move up and down each of multiple cushion pad independently.

The die cushion of 11. forcing presses according to any one of-10 according to Claim 8, also Including:

Multiple die buffer force detectors, detection is applied to the die buffer of multiple respective cushion pad Power；

Each of wherein said multiple die buffer controller includes die buffer force controller and mould Tool cushion effect control and compensation device, described die buffer force controller includes die buffer power command device, The output of described die buffer power command device is corresponding to the single mould of each of multiple cushion pads Cushion effect order, described die buffer power control and compensation device is based on from described die buffer power command device Output die buffer power order and delayed by the corresponding mould in multiple die buffer force detectors The die buffer power of impulse force detector detection controls each of multiple die buffer force producer, with Apply independent die buffer power to the corresponding cushion pad in multiple cushion pads.

The die cushion of 12. forcing presses according to claim 11,

Wherein corresponding to multiple cushion pad force detector quilts of multiple respective die buffer force producers Arrange, be applied to each of multiple cushion pad with detection from multiple respective die buffer force producers Die buffer power,

Wherein corresponding to multiple cushion pads the die buffer power command device of each export corresponding to Each of two or more die buffer force producers being arranged in each of cushion pad Respective die buffer pressure command, and

Plurality of die buffer power control and compensation device is based on exporting from die buffer power command device Die buffer power order and by multiple die buffer force detectors corresponding die buffer power examine The die buffer power surveying device detection controls multiple respective die buffer force producer, independent to apply Die buffer power give the corresponding cushion pad in multiple cushion pads.

The die cushion of 13. forcing presses according to claim 12,

Wherein the die buffer power command device corresponding to each in multiple cushion pads can be arranged The general die buffer power order of each corresponding to cushion pad maybe can be for being arranged in cushion pad Each in each of two or more die buffer force producers single mould is set Cushion effect order, and the die buffer power order set by output.